摘要
采用有限体积法,对雷诺数Re为100和200的左"品"字形布置等边三方柱的绕流问题进行了数值模拟,分析了间距比在1.2~6.0范围内,流场流动特性、柱体阻力系数、升力系数及斯特劳哈尔数的变化规律,重点研究了临界间距比,并成功捕捉到了上述两个雷诺数下三方柱绕流的临界间距比.结果表明:间距比对流场特性与结构具有非常重要的影响.Re为100时,偏流现象消失的临界间距比为3.7;Re为200时,偏流现象消失的临界间距比为4.1;Re为200时的流场比100时的更不稳定;随着雷诺数的增加,偏流现象消失的临界间距比增大.
A flow around three equispaced square cylinders arranged in equilateral left-triangular is numerically investigated at Reynolds number of 100 and 200 based on a finite-volume method. The spacing ratio g is set ranging from 1.2 to 6.0, and the flow is supposed to be laminar. The numerical results show that the spacing ratio has a significant effect on the flow pattern. Especially the critical spacing ratio, as a key parameter to affect the flow pattern and dynamic characteristics of the flow field, is examined in detail. When the Reynolds number is 100, the critical spacing ratio of bias flow disappears is 3.7 ; When the Reynolds number is 200, the critical spacing ratio of bias flow disappears is 4.1. The flow field at Re = 200 is less stable than the case of Re = 100. The critical spacing ratio increases with the increase of Reynolds number.
作者
刘欢
LIU Huan(School of Energy and Safety Engineering, TCU, Tianjin300384, Chin)
出处
《天津城建大学学报》
2018年第1期33-39,共7页
Journal of Tianjin Chengjian University
关键词
三方柱绕流
数值模拟
间距比
阻力
升力
斯特劳哈尔数
临界间距比
flow around three square cylinders
numerical simulation
spacing ratio
drag
lift
Strouhal number
critical spacing ratio
